In TCP implementation, when receiving the SYN request from the client, the server needs to reply the SYN + ACK packet to the client, and the client also needs to send the confirmation packet to the server. Usually, the initial serial number of the server is calculated by the server according to certain rules or adopts random numbers. However, in SYN cookies, the initial serial number of the server is obtained by hash operation and encryption of the client IP address, client port, server IP address, server port and other security values, which is called cookie. When the server suffers from SYN attack and makes the backlog queue full, the server does not reject the new SYN request, but replies the cookie (SYN serial number of the reply packet) to the client. If it receives the ACK packet from the client, the server subtracts 1 from the ACK serial number of the client to obtain the cookie comparison value, and performs a hash operation on the above elements to see if it is equal to the cookie. If equal, complete the three-way handshake directly (Note: At this time, you don't need to check whether this connection belongs to the backlog queue).
Pingu是一只来自南极的年轻企鹅，它与它的母亲、父亲(当地的邮递员)及年幼的妹妹Pinga一起生活。Pingu只是喜欢玩耍，它很淘气，但心肠很好。如大多数的妹妹一样，Pinga也从不会错过取笑Pingu的机会。不过他们有时候仍然很喜欢相互玩耍。Robby这只海豹是Pingu最要好的朋友之一，不论它们是在一起钓鱼或是玩捉迷藏，它们总要冒很大的险。
Five, the difference between mind map and traditional linear note-taking
Black line: jiuxiong* …
Although there is still a huge gap between this and the real sense of near death, when a large living person lies in such a ritual space, it is inevitable that when "people are going to die", there are still some outstanding wishes, unworthy people, things to cherish and various insights left in the world.
剧情讲述被逼到绝境的男人接到女富豪的诱惑性提议并做出无法挽回的选择，过程中描绘四名男女不可预测的爱情。
Priority order (from high to low):
huilai的时候，yijing被人察觉到了。
于是，众人尚在咂摸香荽的话，就见哭得泪眼朦胧的青莲急忙抬头道：我……不挑食，把大黄的骨头分我啃几块就成了。
其中就有着一个历史上所不为人知的秘密组织“樱井机关”存在着。
You right-click on the monster, and the white characters that appear are ordinary attacks.
精彩看点
?快来吧,.!在成皋布置城防的周勃最先回去，远在洛邑的曹参也被紧急召见，马不停蹄地赶回荥阳去了。
装饰屋里是可以，可咱们村大多人并不讲究装饰。
跟随亚利桑那州纳瓦霍族保留地的钦利高中篮球队，看他们如何力争赢得州冠军，为他们与世隔绝的社区带来骄傲。
Impeachment of the queen, asking the emperor to scrap the passbook like snowflakes, flew to the cabinet, the emperor...
三十年代上海一个平凡的黄昏，傅叟南与容采月在电车上邂逅，南对彩一见钟情，在南心中留下一片不可磨灭的印象，一个矢志不渝，纠缠半生的爱情故事也因而牵起了序幕……
当一所新出租的房子搬走后，会遇到健忘症幽灵。营救发生在死亡49天后。让我们一起来看看他能否逃脱的结论。
2. In the above example, a set of state objects are created for each Context object. In fact, these state objects can be shared, and each Context object can share one state object. This is also one of the application scenarios of the meta-sharing mode
